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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabe5ff3e88d91703b1cde5c0fe16fae9b0e1964b84ae19d12d8ae1589008f00' 
  AND token = 'XzH794Rkw4t9S+SAZiPgXozzypu+UmwC55MSaTbbPX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}